2026-07-30T22:35:19Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/69832022-09-22T00:06:39Zcom_10259_5822com_10259_5086com_10259_2604col_10259_5823

Páez, Teresa Martínez Cuezva, Alberto Palma, Jesús Ventosa Arbaizar, Edgar 2022-09-21T11:00:10Z 2022-09-21T11:00:10Z 2019-11 2574-0962 http://hdl.handle.net/10259/6983 10.1021/acsaem.9b01826 2574-0962 Alkaline flow batteries are attracting increasing attention for stationary energy storage. Very promising candidates have been proposed as active species for the negative compartment, while potassium ferrocyanide (K4Fe(CN)6) has been the only choice for the positive one. The energy density of this family of batteries is limited by the low solubility of K4Fe(CN)6 in alkaline media. Herein, we propose a general strategy to increase the energy density of this family of alkaline flow batteries by storing energy in commercial Ni(OH)2 electrodes confined in the positive reservoir. In this way, K4Fe(CN)6 dissolved in the electrolyte acts not only as electroactive species but also as charge carrier between current collector and solid Ni(OH)2 particles located in an external reservoir. A storage capacities of 29 Ah L–1 for the positive compartment is demonstrated. The concept is implemented in three systems, Zn–K4Fe(CN)6, anthraquinone–K4Fe(CN)6, and phenazine–K4Fe(CN)6 alkaline flow battery, showing the versatility of the strategy. Challenges and future directions to exceed the 16 Wh Ltotal–1 demonstrated in this work are discussed. Comunidad de Madrid in the Framework of the Talent Attraction Programme (Grant 2017-T1/AMB-5190) and the Spanish Ministry of Science, Innovation and Universities in the Framework of the Research Challenges Programme (Grant RTI2018-099228-A-I00) is gratefully acknowledged. A.M.-C. thanks Ministerio de Ciencia, Innovación y Universidades for a Ramon y Cajal contract and funding (Grant RYC-2017-22700). application/pdf eng American Chemical Society ACS Applied Energy Materials. 2019, V. 2, n. 11, p. 8328–8336 https://doi.org/10.1021/acsaem.9b01826 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-099228-A-I00/ES/BATERIAS INJECTABLES DE ELECTRODES SEMI-SOLIDOS info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/RYC-2017-22700 info:eu-repo/grantAgreement/CAM//2017-T1%2FAMB-5190 Energy storage Batteries Redox mediators Energy density Ferrocyanide Química analítica Chemistry, Analytic Mediated Alkaline Flow Batteries: From Fundamentals to Application info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion info:eu-repo/semantics/openAccess ACS Applied Energy Materials 2 11 8328 8336